\pgfkeys{/tikz/.cd,start coordinate/.initial= { 0,\vertfactor },start coordinate/.initial= { 0,\vertfactor },start coordinate/.initial= { 0,\vertfactor },

	start coordinate/.initial= { 0,\vertfactor },another/. style= { 0,\vertfactor } ,

	start coordinate/.initial={0,\vertfactor}{something else},
}
